ML20217R090

Notice Re Dwyer Request That NRC Suppl 2.206 Petition Currently Being Considered by Nrc.Petitioner Request Denied

ML20217R090
Person / Time
Site:	San Onofre
Issue date:	06/26/1997
From:	Miraglia F NRC (Affiliation Not Assigned)
To:
Shared Package
ML20217R075	List: ML20217R072 ML20217R090
References
2.206, NUDOCS 9709040186
Download: ML20217R090 (2)

Text

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i 7590-01 UNITED STATES NUCLEAR REGULATORY COMMISSION

'l SOUTHERN CAllFORNIA EDISON COMPANY. ET AL.

SAN ONOFRE NUCLEAR GENERATING STATION DOCKET NOS. 50-361 AND 50-362 RECEIPT OF PETITION FOR DIRECTOR'S DECISION UNDER 10 CFR 2.206 Notice is hereby given that by e-mail request dated April 25, 1997, Stephen Dwyer (Petitioner) requested that the U.S. Nuclear Regulatory Commission (Commission or NRC) supplement his 2.206 petition dated September 22, 1996, which is currently being considered by the NRC. In his September 22 2.206 petition, Mr. Dwyer requested that the NRC shut down the SONGS units as soon as possible pending a complete review of the seismic design of the SONGS units based on the new information gathered from the Landers and Northridge quakes. By NRC letter dated flovember 22, 1996, the NRC denied the Petitioner's September 22 request that the Commission immediately shut down SONGS.

In his April 25 e-mail to NRC Chairman Jackson, Mr. Dwyer specified his concerns related to the ability of the San Onofre Nuclear Generating Station (SONGS) steam generators to withstand a major seismic event. Specifically, Mr. Dwyer stated that the ability of the SONGS steam generators to withstand a major seismic event is seriously compromised by the degradation recently observed in the SONGS Unit 3 steam generator internal tube supports (eggerate supports). You requested an investigation to determine if Unit !! has experienced degradation similar to that found in Unit 3. You also stated that further seismic analysis should be performed for the SONGS steam generators 9709040186 970626 DR ADOCK 050003 1

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and that a retrofitting upgrade of the steam generator supports could be accomplished at this time. For the reasons stated in NRC's letter of June 26,1997, the staff will treat this request as a separate petition and not supplement Mr. Dwyer's September 22 2.206 petition with his concerns 1

.regarding the oggerate supports.  !

The request is being treated pursuant to 10 CFR 2.206 of the l Commission's regulations. By letter dated June 26, 1997, the Petitioner's request that the Comission immediately shut down SONGS was denied. As provided by Section 2.206, appropriate action will be taken on this request within a reasonable time.

A copy of the Petition is available for inspection in the Commission's Public Document Room at 2120 L Street, NW, Washington, DC 20555-0001, and the Local Public Document Room at the Main Library, University of California, P. O. Box 19557, Irvine, CA 92713.

Dated at Rockville, Maryland, this 26th day of June 1997.

FOR THE NUCLEAR REGULATORY COMMISSION Frank J. glia ng Director Office of uclear Reactor Regulation 4

i .

i From: stephen dwyer <smdQwdc net >

! To:

W.dDi WNP2(Chairman) l Date: 4f2$/97131pm l

Subject:

SONGS SO SUPPORTS & SEISMIC RISK j Dr Shirtey Jackson. Chairman Re San Onofre SG Supports i Nuclear Regulatory Commisson I Washington. O C t

t f Honorable Chairman, I recently recieved (through the grapevine, not SCE) the 417 07 report from

. San Onofre

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Subject DEGRADATION Or STEAM GENERATOR (SG)(NTERNAL TUBE SUPPORTS

( AKA EGG CRAT ES)

I am espectatly concerned about this new additongl weakness at San Onofre I tscheve that the plant will not to able to withstand completely a major seismic event, and am addin new concern to my emetgency petition If the egg crates are somewhat corroded to seriously corroded. this could senously compromise the seismic resistance of this vitalcomponent i

li the tutes can te Shaken even skghtly they could come loose and a large number could rupture Since '

' the corrosion is widespread and on both hot and cold legs. #t appears to be senous This level of corrosion '

may also be affecting the tubes themselves Whatever the seventy of degradation, any corrosion would senously weaken the supports and dramatically decrease their seismic resistance to below the DDE

(

Considenng the wide range of problems in other SGs, senous problems with the SGs at SONGS can te i

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i degradahonVirtually enpected was found anyin problem can make the SGs vunerable to seismic events Apparently after this i Unit 3 a *hmited inspection" of Unit 2 was done But, it revealed nothing its hard to Imagine that this twin SG was not even affected at all it it wastri degraded then the reasons should beinvestigated fu' i to find Out why This would be very valuable informahon to use to preven! Jegradtion elsewhere I

l . But I have senous doubts that this is the case A very thorough investigaton should be done to find any

corrosen similar to Unit 3 There is a very htgh probability that there as corrosion somewhere

) A further general seismic evaluation upgrace should be done for these SGs, and a retrofitting upgrade of l the SG supports could be done at this time e

This retrofttting could te with heav er guage steel or stainless steel on both units Thank you for looking into this matter l-l Sincerely,

! Stephen Dwyer smd@wdc net j

j CC:

WCD1 WCP1(kep) WND1 WNP2(jas),WND2 WNP3(whb.mbf1).

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